/*
  TwoWire.h - TWI/I2C library for Arduino & Wiring
  Copyright (c) 2006 Nicholas Zambetti.  All right reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

  Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
  Modified 2020 by Greyson Christoforo (grey@christoforo.net) to implement timeouts
*/

#ifndef TwoWire_h
#define TwoWire_h

#include <inttypes.h>
#include "Stream.h"

#define BUFFER_LENGTH 32

// WIRE_HAS_END means Wire has end()
#define WIRE_HAS_END 1

class TwoWire : public Stream {
    private:
        static uint8_t rxBuffer[];
        static uint8_t rxBufferIndex;
        static uint8_t rxBufferLength;

        static uint8_t txAddress;
        static uint8_t txBuffer[];
        static uint8_t txBufferIndex;
        static uint8_t txBufferLength;
        static uint8_t txStatus;

        static uint8_t transmitting;
        static void (*user_onRequest)(void);
        static void (*user_onReceive)(int);
        static void onRequestService(void);
        static void onReceiveService(uint8_t*, int);
    public:
        TwoWire();
        void begin();
        void begin(uint8_t);
        void begin(int);
        void end();
        void setClock(uint32_t);
        void setWireTimeout(uint32_t timeout = 25000, bool reset_with_timeout = false);
        bool getWireTimeoutFlag(void);
        void clearWireTimeoutFlag(void);
        void beginTransmission(uint8_t);
        void beginTransmission(int);
        uint8_t endTransmission(void);
        uint8_t endTransmission(uint8_t);
        uint8_t requestFrom(uint8_t, uint8_t);
        uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
        uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t);
        uint8_t requestFrom(int, int);
        uint8_t requestFrom(int, int, int);
        virtual size_t write(uint8_t);
        virtual size_t write(const uint8_t*, size_t);
        virtual int available(void);
        virtual int read(void);
        virtual int peek(void);
        virtual void flush(void);
        void onReceive(void (*)(int));
        void onRequest(void (*)(void));

        inline size_t write(unsigned long n) { return write((uint8_t)n); }
        inline size_t write(long n) { return write((uint8_t)n); }
        inline size_t write(unsigned int n) { return write((uint8_t)n); }
        inline size_t write(int n) { return write((uint8_t)n); }
        using Print::write;
};

extern TwoWire Wire;

#endif

